Fix Fly runtime image compatibility

Author: nelsonjchen

Dockerfile

@@ -16,11 +16,12 @@ RUN cargo chef cook --release --recipe-path recipe.json
 COPY . .
 RUN cargo build --release --bin github-wiki-see
 
-# We do not need the Rust toolchain to run the binary!
-FROM gcr.io/distroless/cc-debian12 AS runtime
+# Keep the runtime libc in the same Debian generation as the Rust builder.
+FROM gcr.io/distroless/cc-debian13 AS runtime
 WORKDIR /app
 COPY --from=builder /app/target/release/github-wiki-see /usr/local/bin/github-wiki-see
 
 ENV ROCKET_ADDRESS=0.0.0.0
+ENV ROCKET_PORT=8000
 
 CMD ["/usr/local/bin/github-wiki-see"]

src/main.rs

@@ -479,16 +479,8 @@ fn versionz() -> String {
 }
 
 #[get("/healthz")]
-fn healthz() -> content::RawHtml<String> {
-    let mirrored_content = content_to_html(
-        Content::Markdown(String::from(
-            "# Health Check\n\n- parser\n- renderer\n- rewrites",
-        )),
-        "health",
-        "check",
-        "Home",
-    );
-    content::RawHtml(mirrored_content)
+fn healthz() -> &'static str {
+    "ok"
 }
 
 #[launch]